package com.atguigu.web;

import com.atguigu.pojo.Book;
import com.atguigu.pojo.Page;
import com.atguigu.service.BookService;
import com.atguigu.service.BookServiceImpl;
import com.atguigu.utils.WebUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;


public class BookServlet extends BaseServlet{

    BookService bookService=WebUtils.getBean(BookService.class);
    protected void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        int pageNo=WebUtils.parseInt(req.getParameter("pageNo"),0);
        pageNo+=1;

        //1.获取请求的参数==封装成为Book对象
        Book book = WebUtils.copyParamToBean(req.getParameterMap(), new Book());

        //2.调用BookService.addBook()保存图书
        bookService.addBook(book);

        //3.跳到图书列表页面
        //   /manager/bookServlet?action=list

        //请求转发的斜杠表示工程名
//        req.getRequestDispatcher("/manager/bookServlet?action=list").forward(req,resp);

        //请求重定向的斜杠表示端口号
        resp.sendRedirect(req.getContextPath()+"/manager/bookServlet?action=page&pageNo="+pageNo);
    }
    protected void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数id,图书编号

        int id=WebUtils.parseInt(req.getParameter("id"),0);

        //2.调用bookService.deleteBookById();删除图书
        bookService.deleteBookbyId(id);

        //3.重定响应图书列表管理页面
        resp.sendRedirect(req.getContextPath()+"/manager/bookServlet?action=page&pageNo="+req.getParameter("pageNo"));
    }
    protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数==封装成为Book对象
        Book book = WebUtils.copyParamToBean(req.getParameterMap(), new Book());
        //2.调用BookService.updateBook(book);修改图书
        bookService.updateBook(book);
        //3.重定向会图书列表管理页面
        //地址：/工程名/manager/bookServlet?action=list
        resp.sendRedirect(req.getContextPath()+"/manager/bookServlet?action=page&pageNo="+req.getParameter("pageNo"));
    }

    protected void getBook(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数编号
        int id = WebUtils.parseInt(req.getParameter("id"), 0);
        //2.调用bookService.queryBookById查询图书
        Book book = bookService.queryBookById(id);
        //3.保存到图书到Request域中
        req.setAttribute("book",book);
        //4.请求转发到 /pages/manager/book.edit.jsp页面
        req.getRequestDispatcher("/pages/manager/book_edit.jsp").forward(req,resp);
    }

    protected void list(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.通过BaseService查询全部图书
        List<Book> books = bookService.queryBooks();
        //2.把全部图书保存到Request域中
        req.setAttribute("books",books);
        //3.请求转发到/pages/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
    }

    /**
     * 处理分页功能
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的参数 pageNo和pageSize
        int pageNo = WebUtils.parseInt(req.getParameter("pageNo"), 1);
        int pageSize=WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
        //2.调用BookService.page(pageNo,pageSize):page对象
        Page<Book> page=bookService.page(pageNo,pageSize);

        page.setUrl("manager/bookServlet?action=page");

        //3.保存Page对象到Request域中
        req.setAttribute("page",page);
        //4.请求转发到pages/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/manager/book_manager.jsp").forward(req,resp);
    }
}
